W8_acids - Chem 125 Winter 2007 Dr. Retsek Worksheet 8:...

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Chem 125 Dr. Retsek Winter 2007 Worksheet 8: Acid and Base Basics 1. For each of the following, determine [H 3 O + ], [OH - ], pH, pOH and whether or not the solution is acidic, basic, or neutral. a. A rainwater sample with a pH of 4.35 b. An ammonia sample with a pH of 11.28 c. A 0.015 M solution of HCl (aq). d. A sample of Ca(OH) 2 with a concentration of 0.16 g Ca(OH) 2 /100.0 mL solution e. A 3.00% KOH solution by mass that has a density of 1.0242 g/mL 2. The following is a list of weak acids and their K a values: HOCl hypochlorous acid 3.5 x 10 -8 H 2 S hydrogen sulfide 1.1 x 10 -7 HCN hydrocyanic acid 4.0 x 10 -10 HNO 2 nitrous acid 4.5 x 10 -4 a. Which acid given above is the strongest? Explain your choice. b. Write the K a expression for the strongest acid. c. Which acid has the strongest conjugate base? Explain your choice. 3. What is the pH of the solution obtained when 125 mL of 0.606 M NaOH is diluted to 15.0 L with water? 4. For each of the following, identify the conjugate acid-base pairs (identify the acid and
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W8_acids - Chem 125 Winter 2007 Dr. Retsek Worksheet 8:...

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